Berapakah panjang BC ?

28 cm + 21 cm = 49 cm

BC :
: [tex] \frac{49}{21} = \frac{56}{bc} [/tex]
: [tex]49bc \: = 1.176[/tex]
: [tex]bc = 24 \: cm[/tex]
Maaf Kalau Salah

BC = BC/DE = AB/AD
      = BC/56 = 21/49 ⇒ dibagi 7
      = BC/56 = 3/7 ⇒ dikali silang
      = 7 BC = 56 × 3
      = 7 BC = 168
      = BC = 168/7
               = 24 cm

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